Kubernetes 1.15 sharpened extensibility and stability with CRD refinements, CSI upgrades like volume cloning, and kubeadm enhancements for production-ready clusters.
Kubernetes 1.13 graduates kubeadm, CSI and CoreDNS, adds admission webhook GA, kubectl plugin extensibility, and solidifies Windows and device plugin support.
Kubernetes 1.10 promotes CSI and local persistent volumes to beta, introduces pod priority & preemption, dynamic kubelet configuration, and tighter security integrations for production clusters.
Kubernetes 1.9 brought apps/v1 GA, expanded ecosystem support for Windows and Docker, and maturity upgrades across storage and admission-control.
The CSI 0.1 specification debuts with a vendor-neutral API for provisioning, publishing and managing storage across Kubernetes and other orchestrators.
How StorageClasses and external provisioners in 2016 set the stage for the Container Storage Interface.